Here’s a fun, very simple classroom game you can play for multiplication. You may know the game 21, aka blackjack. In classrooms, I like to play with a deck that only includes numbers from 1 to 10. Twenty-one. Each player gets two cards (face up). They can “hit” to take another card, or “stay” to stick with what they have. Whoever …

Happy post-Thanksgiving! To all Seattlites looking for a math-rich event for kids, we’ve finally got some Math Salons on the calendar, starting in January. Interested in joining us? Just rsvp, and we’ll see you there. In other news, Randall Munroe recently created this incredibly dense poster of information, tracking money, how much of it there is, and what it gets …

Back from the math salon and feeling great. I’ve been able to make some minor adjustments since the last one: I added a challenge problem, a group game after people have mostly arrived to break the ice, a little discussion of the relation of games to questions and math, and more written down to help people jump right into playing …